Christie’s amphibious gun carrier returns to the land (US National Archives)

More of a gun carrier than a tank, as the vehicle was open topped, it was, however, equipped with a 75mm field gun. During the footage it not only seamlessly operates on both land and water, it also fires four rounds as it crosses a body of water at the Aberdeen Proving Ground.

Very little is known about the vehicle but it is believed to be the second of three amphibious vehicles developed by Christie during the 1920s. None of the vehicles were purchased by the US military and no major international orders were made either.

Christie’s amphibious gun carrier opens fire with its gun as it travels across a body of water (US National Archives)

The vehicle itself is manned by two people during the demonstration, presumably one steering while the other mans the gun. It appears to have narrow tracks over its four sets of wheels and a pair of propellers at the rear.

Bibliography:

Demonstration of Ordnance Materiel at Aberdeen Proving Grounds, 1920-1926, US National Archives, (source)